Dolby Laboratories Multichannel Audio Tool DP570 - Manual (Page 47)

Setting Dynamic Range Control
Dolby ® DP570 Multichannel Audio Tool User’s Manual 31
Figure 4‐7
To measure dialogue level using the remote software, use the controls shown in Figure 4‐4
for these steps:
1. Use the Channel Select control to choose a channel or channels to measure. The
choices are: Left, Right, Stereo, Center, and All.
2. Play the audio clip.
The DP570 begins measuring the level of the audio clip. The software display of the
measured level varies widely at first, but the measurement is an average level over
time so the display stabilizes as the clip continues.
3. The default measurement mode is Infinite. Click the Infinite or Short Term button to
move back and forth between the modes.
The software displays the level of the audio clip. This level is displayed until you start
a new measurement or change modes.
4. Repeat these steps with each audio clip selected. The DP570 should return similar
values for each of the clips. If the variation between the clips is 4 dB or less, select a
value for the dialogue level parameter within that range that best indicates the
average level of the program content. At any time, to use the measurement level
displayed on the software, click Accept, and the dialogue level parameter is set at that
level. To set the dialogue level parameter manually, click and drag the Dialogue Level
Set slider to the setting you want.
4.8 Setting Dynamic Range Control
You can choose dynamic range control (DRC) profiles for RF and Line modes. Use the
emulator to monitor the effects of each profile setting on the program content and select the
profile that best suits the material in each mode. Both RF and Line modes can be set to any
of the following profiles: None, Film Standard, Film Light, Music Standard, Music Light,
Note: The measurement function used in the following procedures is designed to
measure dialogue only. Programs without dialogue, such as an all‐music program,
still require a careful setting of the dialogue level parameter. When setting the
parameter for such content, it is useful to compare the program to the level of other
programs. The goal is to allow the consumer to switch to your program without
having to adjust the volume control.
Note: If the input audio level registers below –31 dBFS, the Accept button is disabled, as
those values are not valid settings for the dialogue level parameter. Below
–40 dBFS, the front‐panel display reads LOW. In either case, it is best to raise the
source audio level and remeasure the selected audio clip.
Tip: If the DP570 measures more than a 4 dB difference in the audio clips, reconsider the
clips you have chosen, recalling that these clips should represent normal speech level
in your content.